EP0565551B1 - Procede pour le lavage de vaisselle dans de grandes installations - Google Patents

Procede pour le lavage de vaisselle dans de grandes installations Download PDF

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Publication number
EP0565551B1
EP0565551B1 EP92901392A EP92901392A EP0565551B1 EP 0565551 B1 EP0565551 B1 EP 0565551B1 EP 92901392 A EP92901392 A EP 92901392A EP 92901392 A EP92901392 A EP 92901392A EP 0565551 B1 EP0565551 B1 EP 0565551B1
Authority
EP
European Patent Office
Prior art keywords
oil
fat
zone
supplied
waste water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92901392A
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German (de)
English (en)
Other versions
EP0565551A1 (fr
Inventor
Siegmund Krauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Lufthansa AG
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Deutsche Lufthansa AG
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Filing date
Publication date
Application filed by Deutsche Lufthansa AG filed Critical Deutsche Lufthansa AG
Publication of EP0565551A1 publication Critical patent/EP0565551A1/fr
Application granted granted Critical
Publication of EP0565551B1 publication Critical patent/EP0565551B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/24—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors
    • A47L15/241—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane
    • A47L15/245—Washing or rinsing machines for crockery or tableware with movement of the crockery baskets by conveyors the dishes moving in a horizontal plane the dishes being placed directly on the conveyors, i.e. not in dish racks
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A47L15/0005—Rinsing phases, e.g. pre-rinsing, intermediate rinsing, final rinsing
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0031—Water discharge phases
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4217—Fittings for water supply, e.g. valves or plumbing means to connect to cold or warm water lines, aquastops
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4219—Water recirculation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4223—Devices for water discharge, e.g. devices to prevent siphoning, non-return valves
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4291—Recovery arrangements, e.g. for the recovery of energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2601/00—Washing methods characterised by the use of a particular treatment
    • A47L2601/02—Pressurised cleaning liquid delivered by a pump

Definitions

  • the invention relates to a method for washing dining utensils in large plants in several successive process steps, wherein the dining utensils go through several washing zones, in which the supplied washing water, partially mixed with surfactants, is passed in cascade-like fashion in the opposite direction to the respective previous washing zone as washing water , and wherein only surfactant-free fresh water is supplied in a pre-clearing zone.
  • dishwashers designed for example as belt machines are used, through which the dishes to be washed are conveyed on a conveyor belt.
  • the tableware passes through several rinsing zones, for example a pre-clearing zone, a cleaner circulation zone, a washing zone, a pump rinsing zone and a fresh water rinsing zone. Depending on the type of machine and the special requirements, fewer wash zones can be provided.
  • the rinsing water is collected in a lower collecting basin and cascaded in the opposite direction to the movement of dishes in the respective preceding rinsing zone as rinsing water.
  • the flushing water discharged is contaminated with the surfactants used and has such a high oil and fat content that direct discharge into the sewage pipe is not permitted.
  • the known method primarily serves to save energy.
  • heated fresh water is supplied only to the last rinsing zone; the rinse water supplied to the pre-clearing zone is used in a heat exchanger for preheating the fresh water.
  • the focus is on saving energy.
  • the wastewater discharged contains both surfactants and large amounts of oil and fat and can therefore only be fed into the wastewater pipe after extensive post-treatment.
  • the object of the invention is therefore to provide a method of the type mentioned, with which without elaborate post-treatment processes, a significant reduction in the content of heavy lipophilic substances, especially oils and fats, can be achieved in the wastewater of large-scale dishwashers.
  • This object is achieved in that the wastewater withdrawn from the upstream pre-clearing zone is passed to an oil and fat separation stage and the wastewater withdrawn from the flushing zone located at the end of the cascade is fed directly to the wastewater line.
  • the process steps are carried out in the conventional manner with cascade-shaped wastewater management, but the addition of surfactants or other detergent additives can be considerably reduced compared to the conventional method, because the rinsing water used in the pre-clearing zone - if necessary after heating - is one more effective removal of oil and grease residues.
  • the surfactant-containing wastewater discharged from these further rinsing zones, operated with cascade-shaped wastewater guidance, is so slightly contaminated with oils or fats that it does not have to be passed through an oil and grease separator, but can instead be fed directly into the wastewater line. This will achieved that the oil and fat separator used does not have to process any surfactant-containing waste water, so that the formation of emulsions is limited only to the natural emulsifiers contained in the food residues and is therefore very low.
  • the invention also relates to a method according to the preamble of the independent patent claim 4. This method is carried out in large, single-stage dishwashing machines in which the introduced dinnerware is subjected to several rinsing process steps in succession. This method is part of the prior art.
  • the wastewater supplied to the oil and fat separation stage contains no surfactants as emulsifiers, so that the greatest possible oil and fat separation is made possible, while the wastewater contaminated with surfactants in the subsequent process steps is so low with oils and fats are contaminated that they can be disposed of directly in the sewage pipe bypassing the oil and grease separation stage.
  • the tableware 1 to be washed is located as washware on a conveyor belt 2, which moves in the direction of arrow 3 through the automatic belt machine.
  • the dinnerware 1 passes through a pre-clearing zone 4, a cleaner circulation zone 5, a washing zone 6, a pump rinsing zone 7 and a fresh water rinsing zone 8.
  • the zones 5-7 are made up of upper and lower nozzle bars 9 and 10, respectively the tableware 1 sprayed washing water each collected and collected in a sump 11, sucked in via a pump 12 and then sprayed again through the washing system and the dishes.
  • the previous rinsing zone - with the exception of the pre-clearing zone 4 - is regenerated with the overflow water of the subsequent zone.
  • the overflow is step-shaped so that a return cannot take place.
  • the amount of regeneration water results from the incoming rinse-fresh water.
  • Fresh water heated to 40-80 ° C. or higher is supplied in the pre-clearing zone 4 and contains no additives of surfactants or other detergent additives.
  • the largely oil and fat-containing food residues are removed from the tableware 1 by the temperature and flow effects of the supplied rinsing water and reach the drip pan 11 of the pre-clearing zone 4 Solids can be separated by solid and sludge separators (not shown).
  • the waste water is fed to a heat exchanger 13 and there heats the fresh water supplied to the pre-clearing zone 4.
  • the heat exchanger 13 forms a cooling stage; additionally or instead, a separate cooling stage (not shown) can also be provided.
  • the fresh water should be fed in as hot as possible.
  • a fresh water heating device (not shown) is provided for the pre-clearing zone 4. Instead, it is also possible to do without heating the fresh water.
  • the fresh water supplied to the pre-clearing zone 4 can - as shown - be sprayed directly over the items to be washed or it can be supplied to the pre-clearing zone 4 by means of a circulation process and then sprayed onto the items to be washed.
  • a cascade-like process water flow is carried out in the subsequent rinsing zones 5-8.
  • Fresh water heated to about 40 to 80 ° C. is supplied via a fresh water line 16 in the fresh water rinse zone 8, with which the dinnerware 1 is rinsed clean before it leaves the system.
  • the process water from the fresh water rinse zone 8 reaches the pump rinse zone 7 via a line 8a, with a line 17 Detergent and other rinse aids may be added.
  • the process water passes from the pump rinsing zone 7 via line 7a into the upstream washing zone 6 in order to be used there as rinsing water.
  • the process water from the washing zone 6 passes through a line 6a as rinsing water into the upstream detergent circulation zone 5 in order to carry out the first rinsing process there.
  • the wastewater containing tenside, but which is only slightly loaded with oil or fat, emerges from this cleaner circulation zone 5 and is fed directly via a line 5a at the end of the cascade to the wastewater line 15 behind the oil and fat separation stage 14.
  • Fig. 2 shows a highly simplified representation of a single-stage dishwasher used in a large system.
  • the dinnerware 1 is subjected to several successive rinsing process steps, with rinse water from the upper and lower nozzle bars 9 'and 10' being sprayed onto the dinnerware 1 in the manner already described.
  • the waste water is drawn off from a collecting trough 11 'by means of a pump 12'.
  • a first pre-clearing process step only hot fresh water with a temperature of about 40-80 ° C. is supplied for pre-clearing via a pump 18.
  • the waste water of this first process step which is loaded with solids and in particular oil and fat, but is free of washing and cleaning additives, in particular surfactants, is fed to the waste water line 15 via the pump 12 'and a multi-way valve 19 via an oil and fat separator 14'. In this process step up to 99% of the fats and oils are removed.
  • the multi-way valve 19 is switched in such a way that the waste water drawn off from the collecting trough 11 'is fed directly to the waste water line 15, bypassing the oil and fat separation stage 14'.
  • rinsing water mixed with surfactants and possibly other washing additives is added and, if necessary, circulated by means of a circulation pump.
  • a fresh water rinse is carried out. The resulting wastewater containing surfactants does not pollute the oil and fat separation stage 14 ', but instead reaches the waste water system directly via the waste water line 15.
  • the load values for oils and greases can be reduced below the permissible limit values of the discharge conditions of the municipal or other waste water systems if the pre-clearing operation is carried out appropriately.
  • the consumption of environmentally harmful washing additives, in particular surfactants is considerably reduced without the fresh water consumption being significantly increased compared to conventional methods.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)

Abstract

Lors du lavage de vaisselle (1) dans de grandes installations, la vaisselle (1) parcourt tout d'abord une zone de pré-nettoyage (4) alimentée uniquement en eau fraîche sans agents tensioactifs, de préférence réchauffée. Les eaux usées provenant de cette zone de pré-nettoyage (4) passent par un étage séparateur d'huile et de graisse (14) et sont évacuées dans une canalisation d'évacuation (15). Dans les zones de lavage suivantes (5-8), l'écoulement de l'eau de lavage s'effectue en cascade en contre-courant. L'eau chargée d'agents tensioactifs provenant de la zone de circulation de nettoyage (5) située à l'extrémité de la cascade, est amenée directement à la conduite d'évacuation (15). On obtient ainsi que le fonctionnement de l'étage séparateur d'huile et de graisse (14) n'est pas gêné par la formation d'émulsions provoquée par des agents tensioactifs, et que les eaux usées contenant des agents tensioactifs produits dans les zones de lavage suivantes (5-8) sont si peu chargées d'huile et de graisse qu'elles peuvent être amenées à la conduite d'évacuation (15) sans passer par l'étage séparateur d'huile et de graisse (14).

Claims (6)

  1. Procédé de lavage de vaisselle dans des installations industrielles en plusieurs stades successifs, la vaisselle passant par plusieurs zones de lavage, dans lequel l'eau de lavage d'alimentation mélangée partiellement à des agents tensio-actifs est acheminée, après passage respectif à travers une zone de lavage en cascade, à contre-courant avec la zone de lavage précédant respectivement en tant qu'eau de lavage et on n'achemine que de l'eau fraîche exempte d'agents tensio-actifs dans une zone de pré-déblaiement (4), caractérisé en ce que l'eau usée prélevée de la zone de pré-déblaiement (4) placée en tête est acheminée à un étage de séparation des huiles et des graisses (14) et l'eau usée prélevée de la zone de lavage (5) se trouvant à la fin de la cascade est acheminée directement à la conduite d'évacuation des eaux usées (15).
  2. Procédé selon la revendication 1, caractérisé en ce que l'eau usée prélevée de la zone de pré-déblaiement (4) est acheminée par un étage de refroidissement d'un étage de séparation des huiles et des graisses (14).
  3. Procédé selon la revendication 2, caractérisé en ce que l'étage de refroidissement présente un échangeur de chaleur (13).
  4. Procédé de lavage de vaisselle dans des installations industrielles en plusieurs stades successifs, dans lequel on additionne à l'eau de lavage d'alimentation des agents tensio-actifs au moins dans certains stades du procédé et on n'achemine que de l'eau fraîche chauffée exempte d'agents tensio-actifs dans un stade de pré-déblaiement, caractérisé en ce qu'on n'achemine que l'eau usée produite dans le stade de pré-déblaiement à un étage de séparation des huiles et des graisses (14') et en ce qu'on évacue l'eau usée produite dans les stades de lavage suivants directement sans passer par l'étage de séparation des huiles et des graisses (14').
  5. Procédé selon la revendication 4, caractérisé en ce que l'eau usée produite dans l'étage de pré-déblaiement est refroidie.
  6. Procédé selon la revendication 5, caractérisé en ce que l'eau usée produite dans l'étage de pré-déblaiement est refroidie dans un échangeur de chaleur.
EP92901392A 1991-01-05 1991-12-21 Procede pour le lavage de vaisselle dans de grandes installations Expired - Lifetime EP0565551B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4100164 1991-01-05
DE4100164A DE4100164C1 (fr) 1991-01-05 1991-01-05
PCT/EP1991/002488 WO1992011796A1 (fr) 1991-01-05 1991-12-21 Procede pour le lavage de vaisselle dans de grandes installations

Publications (2)

Publication Number Publication Date
EP0565551A1 EP0565551A1 (fr) 1993-10-20
EP0565551B1 true EP0565551B1 (fr) 1994-09-28

Family

ID=6422578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92901392A Expired - Lifetime EP0565551B1 (fr) 1991-01-05 1991-12-21 Procede pour le lavage de vaisselle dans de grandes installations

Country Status (3)

Country Link
EP (1) EP0565551B1 (fr)
DE (2) DE4100164C1 (fr)
WO (1) WO1992011796A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008053348A2 (fr) * 2006-11-03 2008-05-08 Premark Feg L.L.C. Procédé de lavage de la vaisselle avec régulation du prélavage

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208030A1 (de) * 1992-03-13 1993-09-16 Passavant Werke Verfahren zum reinigen von geschirr in mehrstufigen spuelmaschinen
DE19644438C2 (de) * 1996-10-25 1998-11-12 Premark Feg L L C N D Ges D St Durchlaufgeschirrspülvorrichtung sowie Verfahren zum Reinigen von Geschirr- und/oder Tabletteilen
DE102005039140A1 (de) * 2005-08-18 2007-02-22 Premark Feg L.L.C., Wilmington Transport-Geschirrspülmaschine
DE102005039385A1 (de) * 2005-08-20 2007-02-22 Premark Feg L.L.C., Wilmington Transport-Geschirrspülmaschine
DE102008005876B3 (de) * 2008-01-24 2009-04-30 Meiko Maschinenbau Gmbh & Co.Kg Verfahren zur Selbstreinigung einer Durchlaufspülmaschine
ITMI20111324A1 (it) * 2011-07-15 2013-01-16 Comenda Ali S P A Modulo di risciacquo multistadio perfezionato per macchine lavastoviglie a tunnel, e macchina lavastoviglie a tunnel dotata di tale modulo
SE540355C2 (en) * 2016-10-28 2018-07-31 Wexioedisk Ab Tunnel-type dishwasher and method
EP3366185B1 (fr) * 2017-02-27 2019-10-16 Electrolux Professional S.p.A. Lave-vaisselle
WO2020012435A1 (fr) 2018-07-13 2020-01-16 Lausanne University Hospital Agents de liaison au vih

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB584112A (en) * 1944-06-01 1947-01-07 Bolinders Fabriks Aktiebolag Improvements in dish washing machines
CH340322A (de) * 1949-01-10 1959-08-15 Wefcoma International Ag Geschirrwaschmaschine
SE8105811L (sv) * 1981-10-01 1983-04-02 Electrolux Ab Kontinuerlig diskmaskin
US4615744A (en) * 1984-04-23 1986-10-07 Murtha James L Method of rinsing eating utensils
DE3922067A1 (de) * 1989-07-05 1991-01-17 Henkel Kgaa Verfahren zum spuelen von gebrauchsgeschirr und geschirrspuelmaschine zum durchfuehren des verfahrens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008053348A2 (fr) * 2006-11-03 2008-05-08 Premark Feg L.L.C. Procédé de lavage de la vaisselle avec régulation du prélavage
FR2908033A1 (fr) * 2006-11-03 2008-05-09 Elbeuviennes De Materiels Pour Machine a laver la vaisselle et procede de regulation du prelavage
WO2008053348A3 (fr) * 2006-11-03 2008-06-26 Premark Feg Llc Procédé de lavage de la vaisselle avec régulation du prélavage

Also Published As

Publication number Publication date
DE59103136D1 (de) 1994-11-03
WO1992011796A1 (fr) 1992-07-23
DE4100164C1 (fr) 1992-04-30
EP0565551A1 (fr) 1993-10-20

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